li{
  list-style:none;
}
a{
  text-decoration: none;
}

.select{
  width: 1920px;
  margin: 0 auto;
  position: relative;
}
.form1{
  position: flex;
  width: 100px;
  left:0;
  background-color: orange;
  padding: 20px;
}
ul>li{
  display: block;
  height: 50px;
  position: relative;
}
.form1>ul>li>a{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100px;
  display: block;
  text-align: center;
  margin: 0 auto;
  color:white;
  font-size: 20px;
}
.index{
  border-bottom: 3px solid white;
}
.index>a{
  font-size: 22px;
}
.content{
  display: block;
  width: 300px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top:350px;
  color: orange;
  font-size: 100px;
}
